"An obwelded o e ed s of the housing members 25 ject is to provide an enclosed disconnect switch he stat o a y m e of the switch p for use with a bus which is enclosed in a duct, the ably have e s Cross-section as that Of the housing of the switch being substantially continubus With which t switch is to he used. and the ous with the bus duct and the switch including stationary me b may be t e e s o" . . . .